The last value defines wether the light is positional or directional.

最后一个值定义了光源是位置光源还是方向光。

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If a key is specified both in the positional argument and as a keyword argument, the value associated with the keyword is retained in the dictionary.

如果一个键同时被指定位置参数和作为一个关键字参数，与其关键字相关的值被保留在dict中。

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If a key is specified both in the positional argument and as a keyword argument, the value associated with the keyword is retained in the dictionary.

如果一个键同时被指定位置参数和作为一个关键字参数，与其关键字相关的值被保留在dict中。

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